When a sound is reflected from a distant obje | vedclass

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(B) The velocity of sound increases with an increase in temperature. Thus,the velocity of sound in air is higher on a hotter day.Since the distance be

Vedclass · Accepted Answer

No,the echo is not heard.

Vedclass · Answer

(B) The velocity of sound increases with an increase in temperature. Thus,the velocity of sound in air is higher on a hotter day.Since the distance between the source and the reflecting surface remains constant,the time taken for the sound to travel to the surface and return $(t = \frac{2d}{v})$ decreases as the velocity $(v)$ increases.$A$ human ear requires a minimum time interval of $\frac{1}{10} 	ext{ s}$ (or $0.1 	ext{ s}$) to distinguish an echo from the original sound.On a hotter day,because the velocity of sound is higher,the time interval between the original sound and the reflected sound becomes less than $0.1 	ext{ s}$. Therefore,it becomes difficult or impossible to hear a distinct echo.

When a sound is reflected from a distant object,an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear an echo on a hotter day?

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